Most probably you won't be able to get IBX 11.0.6000.7000, but you can try to get a lower IBX that is different from 11.0.6000.6324 by either downgrading your Windows or using a fresh copy of Windows (a standalone one or use virtual machine like VMWare or Virtual PC).

Please note that some content providers will force you to upgrade your OS so that your IBX will be the latest one, i.e. 11.0.6000.6324.